On Mon, May 21, 2012 at 12:42 PM, Nikolai Kondrashov <spbn...@gmail.com> wrote: > Hi everyone, > > > On 05/19/2012 06:37 PM, Nikolai Kondrashov wrote: >> >> 2. Verify units Wacom uses by asking Wacom engineers and/or measuring it. >> Make kernel driver report it. Make kernel driver report zero-centered >> values. I can make the patches. > > > I've had an opportunity to measure reported tilt values of a Wacom Cintiq > 12WX today. It wasn't a very precise measurement, but it still showed that > the reported values are much likely to be *sines* of the angles and *not* > *degrees*. > > This matches what Waltop Sirius is producing, which is quite expected, > considering they seem to use the same pen technology. > > I've attached my data, along with an OpenOffice.org Calc spreadsheet > containing a graph of angle fractions vs. sine fractions vs. fractions of > reported values. > > I'm not sure what to do with this, yet. > > Sincerely, > Nick
Since your results are at odds with mine, I did some more digging around. Our Windows and Mac drivers do some magic to improve accuracy, but fundamentally they treat the hardware tilt values as angles in degrees rather than sines. I suppose it's possible that the magic compensates for the initial treatment-as-degrees but I find it unlikely. I could bug one of the firmware engineers, but that's overkill IMO. I wish I had the results I got earlier with an Intuos3 and Intuos4 for comparison, but I deleted them shortly after sending my March 30 message. Jason --- Day xee-nee-svsh duu-'ushtlh-ts'it; nuu-wee-ya' duu-xan' 'vm-nvshtlh-ts'it. Huu-chan xuu naa~-gha. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Linuxwacom-devel mailing list Linuxwacom-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxwacom-devel
